setTimeout

[espruino-discuss]

Posted at 2014-12-07 by Hellis

I connected a speaker I ripped out of a old cellphone and connected it between pin C8 and 3.3 V.
I can get sound from it by

analogWrite(C8, 0.1 , {freq : 500})

But when I try to create short sounds it's not cooperating.
Should this not send the sound to the speaker in 0.1 seconds?

setTimeout(function () {analogWrite(C8, 0.1 , {freq : 500})}, 100);

What am I doing wrong?

[espruino-discuss]

Posted at 2014-12-07 by Hellis

Ok, I got it!!
After reading the reference again slower I understood what I was doing wrong.

200 ms second sound:

setTimeout(function() {analogWrite(C8, 0.5 , {freq : 2000})}, 0)

setTimeout(function() {analogWrite(C8, 0)}, 200)

[gfwilliams]

Posted at 2014-12-08 by @gfwilliams

Great! glad you got it sorted!

Minor thing, but to turn the speaker off you could use digitalRead(C8); instead - that'll put the pin back into an 'input' mode - so if for instance you'd connected the speaker between C8 and VCC then it would ensure that it was actually turned off.

[espruino-discuss]

Posted at 2015-01-05 by user51876

I still can't understand the sence of the first setTimeout.
Why not write:

analogWrite(C8, 0.5 , {freq : 2000});
setTimeout(function() {digitalRead(C8);}, 200);

?
And why code

setTimeout("print(1)",2000);
setTimeout("print(2)",1000);

prints
1
2
without delay?

[gfwilliams]

Posted at 2015-01-05 by @gfwilliams

Yes, writing:

analogWrite(C8, 0.5 , {freq : 2000}); 
setTimeout(function() {digitalRead(C8);}, 200); 

would work fine.

I just tried the code exactly as you suggested, and it writes ....2....1 with a 1 second delay between them as expected. Perhaps you could explain exactly how the code is being used? Is it possible that when you tried it you didn't have the quotes?

[espruino-discuss]

Posted at 2015-01-05 by DrAzzy

Weren't there some firmware versions recently where timekeeping was not working correctly?

I think time-keeping in general was broken on a bunch of my bigram builds (from nov 11 to mid/late december) - were you using one of those?

[gfwilliams]

Posted at 2015-01-05 by @gfwilliams

Well, if you set a timeout on onInit then saved it, you could have problems with some builds. But I'm not sure that's what @user51876 is doing - he definitely didn't suggest he'd done anything like that.